begin to do 和 begin doing 的区别

dandan74

看OG中的一题，突然发现对begin to do和begin doing理解不清，哪位大虾给解释一下，附题：
124. During Roosevelt's years in office, Black Americans began voting for Democrats rather than Republicans in national elections, but Black support for Democrats at the state and local levels developed only after when civil rights legislation was supported by Harry Truman.
(A)    developed only after when civil rights legislation was supported by Harry Truman
(B)    developed only after when Harry Truman supported civil rights legislation
(C)    developed only after Harry Truman's support of civil rights legislation
(D)    develops only at the time after the supporting of civil rights legislation by Harry Truman
(E)    developed only after there being Harry Truman's support of civil rights legislation

anchoret

begin to do和begin doing都可以